A Bioreactor Designed for Restricting Oversize of Aerobic Granular Sludge

Aerobic granular sludge (AGS) with oversized diameter commonly affects its stability and pollutant removal. In order to effectively restrict the particle size of AGS, a sequencing batch reactor (SBR) spiny aeration device was put forward. A conventional SBR (R1) an (R2) treating tannery wastewater were compared in laboratory. The result indicates that from R2 smaller than R1 granulation. spines air bubbles could AGS by collision abrasion. Nevertheless, there no significant change mixed liquor suspended solids (MLSS) volume index (SVI) either bioreactors. removal (%) chemical oxygen demand (COD) ammonia nitrogen (NH4+-N) these two bioreactors did not differ each other greatly. analysis biological composition displays proportion Proteobacteria decreased slightly R2. X-ray fluorescence (XRF) revealed less accumulation Fe Ca granules. Furthermore, pilot-scale successfully utilized granules at about 300 μm.